點晶科技股�½有限公司
SILICON TOUCH TECHNOLOGY INC
.
新竹市科學園區展業一路 9 號 7 樓之 1
9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C.
Tel：886-3-5645656
Fax：886-3-5645626
DM634
Equivalent Circuit of Inputs and Outputs
1. DCK, DAI,
LAT
, SOMODE/GCK terminals
2. DAO terminals
PCB Layout Consideration
To connect an external resistor to REXT pin and ground can determine the maximum output
current. If there is any disturbance occurred to REXT pin, the constant current output may be
unstable or noisy. Since REXT (pin23), DAO (pin22), and SOMODE/GCK (pin21) are next to each
other, the most possible interference is caused by DAO or SOMODE/GCK signal. Accordingly, it is
recommended that adding some shielding area within the above pins in PCB layout, or laying the
signal line of above pins on different PCB layer will prevent the noise problems effectively.
16-channel 16-bit PWM Constant Current LED Driver
Version : A.003
Page 4
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